I don't think it's selling very well, so sadly, I'd be shocked to see any more dates.

Well this is a new date that was just added in Michigan.

I kept saying the same as you how slow these dates are selling but then I looked at other acts in the same venues and they looked very similar even with closer upcoming dates. Also a more related example and I don't know how accurate, but people keep pointing out how Nicks' recent tour sold really well and even added more dates in the end, while at first all those venues looked half empty. So really aggressive marketing campaign, banners on TM and similar sites and sponsored links on social media are definitely the way to go if judging by Nicks' tour advertising, and I suspect whoever is sponsoring this BM tour might do that as the dates are getting closer.

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"kind of weird: a tribute to the dearly departed from a band that can treat its living like trash"

I am pretty sure that a Nor Cal show at a reasonably sized venue would sell out On the IYD tour Stevie played the Mountain Winery in Saratoga. The tickets were I think around $150 and they should out for sure. I'm sure they would too.